Isuzu 4HL1 Workshop Manual page 155

Step
Check the ECM ground circuit for open wiring.
1. Starter switch "OFF".
2. Disconnect the ECM.
4
3. Measure the resistance between ECM
connector pin and ground (e.g., frame or
body)
Was the resistance within range?
Repair or replace the faulty harness.
5
Is the action complete?
1. Replace the ECM.
IMPORTANT:
If necessary (for the vehicle equipped with
6
idle stop function), input the number of
startups to the replacing ECM.
Is the action complete?
Check DTC52 will not be set again.
1. Using Tech 2, clear the DTC.
7
2. Start the engine and review the DTC.
Is DTC52 detected?
Action
Engine Control System 1A-153
Value(s)
Pins 87/95/
119/120/121-
ground: 0 Ω
Go to Step 6
Verify repair and
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go to Step 6
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Verify repair and
go to Step 7
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Refer to
Diagnostic Aids
and go to Step 1
Yes No
Go to Step 5
Repair is
complete
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